Government Code § 3311
CHAPTER 9.7. Public Safety Officers
Nothing in this chapter shall in any way be construed to limit the use of any public safety agency or any public safety officer in the fulfilling of mutual aid agreements with other jurisdictions or agencies, nor shall this chapter be construed in any way to limit any jurisdictional or interagency cooperation under any circumstances where such activity is deemed necessary or desirable by the jurisdictions or the agencies involved.